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By default, cmd is used to execute commands in Windows containers, but it has some issues executing the command (no output): echo 'hostName' | nc -w 1 -u <targetIP> <targetPort> But it has no issues running (output is correct): echo hostName | nc -w 1 -u <targetIP> <targetPort> This causes the test "should function for node-pod communication: udp" to fail when using Windows Containers.